JPH02300647A - Grain size measurement type smoke sensor - Google Patents
Grain size measurement type smoke sensorInfo
- Publication number
- JPH02300647A JPH02300647A JP1122570A JP12257089A JPH02300647A JP H02300647 A JPH02300647 A JP H02300647A JP 1122570 A JP1122570 A JP 1122570A JP 12257089 A JP12257089 A JP 12257089A JP H02300647 A JPH02300647 A JP H02300647A
- Authority
- JP
- Japan
- Prior art keywords
- light
- smoke
- particle size
- particles
- light receiving
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000000779 smoke Substances 0.000 title claims abstract description 60
- 238000005259 measurement Methods 0.000 title claims description 9
- 239000002245 particle Substances 0.000 claims abstract description 89
- 238000001514 detection method Methods 0.000 claims description 22
- 230000003287 optical effect Effects 0.000 claims description 8
- 239000000428 dust Substances 0.000 abstract description 6
- -1 steam Substances 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000000443 aerosol Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- JOYRKODLDBILNP-UHFFFAOYSA-N Ethyl urethane Chemical compound CCOC(N)=O JOYRKODLDBILNP-UHFFFAOYSA-N 0.000 description 1
- 241000506680 Haemulon melanurum Species 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000001427 coherent effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 239000012141 concentrate Substances 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- CPBQJMYROZQQJC-UHFFFAOYSA-N helium neon Chemical compound [He].[Ne] CPBQJMYROZQQJC-UHFFFAOYSA-N 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000003350 kerosene Substances 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 239000011859 microparticle Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 239000000123 paper Substances 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Abstract
Description
本発明は、煙粒子の粒径を計測することにより、建物内
て火災時等に発生ずる煙を検出する粒径計測型煙感知器
に関するものである。The present invention relates to a particle size measurement type smoke sensor that detects smoke generated in a building during a fire or the like by measuring the particle size of smoke particles.
従来より煙粒子による光の散乱を利用した煙感知器が提
供されている〈特開昭５６−１． ／ｌ ７２９４号公
報、実開昭５８−１７１５９１号公報、特開昭６０−１
０９１８．９号公報、実開昭６０−１３４４９号公報、
実開昭６２−２０３５８号公報等参照）。
従来より提供されている煙感知器では、投光手段と受光
手段とを光軸が一致しないように配置し、投光手段から
投光された光の煙粒子による散乱光を受光手段で受光す
ることにより、煙粒子の存否による受光量の変化に基づ
いて煙粒子を検出するようにしている。
ところで、煙以外に水蒸気やほこりによっても光は散乱
するから、上記構成の煙感知器では誤報が生じやすいと
いう問題がある。このような問題を解決するために、受
光量の変化が所定時間辺上に亙って継続するときに初め
て発報するようにした蓄積型煙感知器が実用に供されて
いる。Smoke detectors that utilize the scattering of light by smoke particles have been provided in the past (Japanese Patent Laid-Open No. 56-1. /l Publication No. 7294, Publication of Utility Model Publication No. 171591/1983, Japanese Patent Application Publication No. 1987-1
Publication No. 0918.9, Publication No. 13449 of 1983,
(See Utility Model Application Publication No. 62-20358, etc.). In conventional smoke detectors, the light emitting means and the light receiving means are arranged so that their optical axes do not coincide, and the light receiving means receives the light emitted from the light emitting means and scattered by smoke particles. As a result, smoke particles are detected based on changes in the amount of received light depending on the presence or absence of smoke particles. Incidentally, since light is scattered not only by smoke but also by water vapor and dust, there is a problem in that the smoke detector having the above structure is likely to generate false alarms. To solve this problem, storage type smoke detectors have been put into practical use that issue an alarm only when a change in the amount of light received continues over a predetermined period of time.
上述のような蓄積型煙感知器では、煙が発生してから発
報されるまでの時間が長く、火災時などでは早期発見に
逆行するという問題がある。
本発明は上記問題点の解決を目的とするものであり、散
乱を生じる粒子の粒径を計測することにより、煙と水蒸
気やほこりとの識別を行うようにして誤報を防止すると
ともに、火災時等の煙の発生を早期に検出てきるように
した粒径計測型煙感知器を提供しようとするものである
。The above-mentioned storage type smoke detector has a problem in that it takes a long time from when smoke is generated to when an alarm is issued, which makes early detection difficult in the event of a fire. The present invention aims to solve the above problems, and by measuring the particle size of particles that cause scattering, it is possible to distinguish between smoke, water vapor, and dust, thereby preventing false alarms and preventing false alarms in the event of a fire. The present invention aims to provide a particle size measurement type smoke detector that can detect the occurrence of smoke such as smoke at an early stage.
本発明では、上記目的を達成するために、干渉性を有す
る平行光線束よりなる光ビームを投光する投光手段と、
投光手段に対向して配置され光ビームの煙粒子による散
乱光を受光する受光手段と、受光手段による受光信号に
基づいて煙粒子の粒径を計測することにより煙粒子の存
在を検出する判別手段とを有する粒径計測型煙感知器に
おいて、受光手段を、投光手段の光軸に直交する受光面
を有し受光面上での光の強度分布を検出するパターン検
出装置と、前方微小角散乱による各次数の回折像を上記
パターン検出装置の受光面上に等間隔に結像するフーリ
エ変換レンズとて構成し、判別手段では、パターン検出
装置で受光した光の強度分布に基づいて粒径を計測する
ようにしているのである。In order to achieve the above object, the present invention includes a light projecting means for projecting a light beam consisting of a bundle of parallel light rays having coherence;
A light receiving means disposed opposite to the light projecting means and receiving light scattered by the smoke particles of the light beam; and a discrimination device for detecting the presence of smoke particles by measuring the particle size of the smoke particles based on a light reception signal from the light receiving means. A particle size measuring type smoke detector having a light receiving means, a pattern detection device having a light receiving surface orthogonal to the optical axis of the light emitting means and detecting the intensity distribution of light on the light receiving surface, and a front micro A Fourier transform lens forms diffraction images of each order due to angular scattering on the light receiving surface of the pattern detection device at equal intervals, and the discriminating means identifies particles based on the intensity distribution of the light received by the pattern detection device. We are trying to measure the diameter.
上記構成によれば、煙粒子の粒径に基づいて煙粒子の存
在を検出するから、水蒸気やほこりなとの煙とは粒径の
異なる他の粒子ての散乱による誤報を防止できるのであ
る。また、煙以外の粒子による誤報が防止できる結果、
煙粒子が所定時間以上に亙って検出されるときに発報す
るというような蓄積型の構成とする必要かないから、火
災感知器として用いれば、火災の〒期発見か行えるよう
になるのである。
次に、本発明の詳細な説明する。エアロゾル（煙を含む
）に含まれる微小粒子の粒径を計測する方法としては、
Ｍ ｉ ｅ散乱理論を基礎とする計測方法が知られてい
る。いま、エアロゾルに対する照射光を干渉性を有する
平行光線とし、散乱を生じる粒子の粒径（直径）をＤ、
照射光の波長をλとして、粒径パラメータαを次のよう
に定義する。
α二πＤ／λ
粒径パラメータαが大きくなると、散乱光は前方に集中
し、明確なフォワードローブが形成されることが知られ
ており、このフォワードローブ内の散乱を前方微小角散
乱と称している。この散乱はフラウンホーファ回折に起
因しているから、主として粒秤により支配され、粒子の
光学的特性にはほとんと影響を受けない。したがって、
回折角がわかれば、粒径パラメータを知ることができ、
粒子の粒径を知ることができるのである。ただし、エア
ロゾルにはいろいろな粒径を有する粒子が含まれている
から、回折角は一恵に決定されるものではなく、回折像
の光量分布によりエアロゾルに含まれる粒子の粒径の範
囲を知ることがてきるのである。また、フラウンホーフ
ァ回折の成立条件は、α〉１であり、対象とする粒子の
粒径の測定範囲は、照射光の波長に依存することになる
。According to the above configuration, since the presence of smoke particles is detected based on the particle size of the smoke particles, it is possible to prevent false alarms due to scattering of particles having a different particle size from smoke, such as water vapor or dust. In addition, as a result of preventing false alarms caused by particles other than smoke,
Since there is no need for an accumulation-type configuration in which an alarm is issued when smoke particles are detected for a predetermined period of time, if used as a fire detector, it will be possible to detect the onset of a fire. . Next, the present invention will be explained in detail. As a method to measure the particle size of microparticles contained in aerosols (including smoke),
A measurement method based on Mie scattering theory is known. Now, let the light irradiated to the aerosol be a coherent parallel beam, and let the particle size (diameter) of the particles that cause scattering be D,
Letting the wavelength of the irradiation light be λ, the particle size parameter α is defined as follows. α2πD/λ It is known that as the particle size parameter α increases, scattered light concentrates forward and a clear forward lobe is formed.The scattering within this forward lobe is called forward small angle scattering. There is. Since this scattering is caused by Fraunhofer diffraction, it is mainly controlled by the particle balance and is hardly affected by the optical properties of the particles. therefore,
If the diffraction angle is known, the particle size parameter can be determined.
This allows us to know the particle size of the particles. However, since aerosols contain particles with various particle sizes, the diffraction angle cannot be determined by Kazue, but rather the range of particle sizes of particles contained in aerosols can be determined from the light intensity distribution of the diffraction image. is coming. Further, the condition for establishing Fraunhofer diffraction is α>1, and the measurement range of the particle size of the target particle depends on the wavelength of the irradiated light.
第１図に示すように、投光手段としてレーザ光源］が配
設され、干渉性を有する平行光線束である光ビームを投
光する。受光手段はレーザ光源］に対向して配設され、
レーザ光源〕との間の空間が煙粒子ａや煙以外の粒子す
の導入される監視空間になる。受光手段は、多数の円形
のホトセル２を同心円状に配列したパターン検出装置３
と、パターン検出装置３の前方に配設されたフーリエ変
換レンズ４とを備えている。すなわち、上記監視空間に
導入された煙粒子によりレーザ光源１からの光ビーノ＼
が散乱され、前方微小角散乱による回折像かフーリエ変
換レンズ４を通して２次元フーリエ変換され、この変換
像がパターン検出装置３の受光面に結像されるのである
。フーリエ変換レンズ４は、光軸に対する光線の入射角
度θと、像の高さ計１と、焦点距離ｆとが、ｈ＝ｆ・５
１１１θという関係に設定されたレンズであって、回折
光がフ−リエ変換レンズ４を通過すると、各次数の回折
像が等間隔に結像されるようになっている。すなわち、
パターン検出装置３の受光面での光軸からの距離が散乱
角の正弦関数になる。このフーリエ変換レンズ４を用い
ていることにより、パターン検出装置３ては、受光面に
ホトセル２を等間隔で配列すればよく、設計か容易にな
るのである。フーリエ変換レンズ４は、微調整装置５に
保持されており、パターン検出装置３の受光面に対する
フーリエ変換レンズ４の光軸の角度を調節したり、パタ
ーン検出装置３との距離を調節することができるように
なっている。パターン検出装置３の出力は、判別手段を
構成するマイクロコンピュータ等の判別装置６に入力さ
れる。判別装置６では、回折光のパターン検出装置３に
よる受光強度の分布パターンに基ついて煙粒子の粒径を
計測し、粒径が煙粒子に相当すると判定されると発報す
るのである。
判別装置６ては次に示すような回折光の強度分布により
粒子の種類を識別する。すなわち、上記実施例と同じ構
成の投光手段と受光手段とを用いて、回折像におりる光
の強度分布を測定すると、第２図のような結果が得られ
る。ここに、レーザ光源１として出力波長が６３３ｎｍ
のへリウムーネオンレーザを用い、ホトセル２を３２個
設け、フーリエ変換レンズ４の焦点距離を６３ｗｘとし
、計測できる粒子の最小径を約０ 、１ ｕｌとしてい
る。
また、第２図（ａ）〜（１１）において、外側のグラフ
図の横軸は粒径（単位はμＲ）、縦軸は粒子数密度（単
位は％）、内側のグラフ図の横軸はホトセル２の番号、
縦軸は受光強度を示ず。ホトセル２は同心円状に配列さ
れており、内側から］、２．・・・・・・、３２と番号
を付しである。したがって、回折角が大きくなる粒径の
小さな粒子に対しては、大きな番号を付したホトセル２
での受光強度が大きくなり、粒径の大きな粒子では、回
折角が小さくなるから、小さな番号を付したホトセル２
ての受光強度が大きくなる。第２図（ａ）〜（ｅ）は、
それぞれウレタン、灯油、紙、木材、綿灯芯を５００〜
６００°Ｃの電気炉内に入れて加熱し、燃焼煙の粒径を
計測した結果てあり、第２図（ｆ）〜（１１）は、それ
ぞれたばこの煙、湯気、はこりについての計測結果であ
る。
計測された粒径は、それぞれ次表のようになった。
以上の計測結果から、はこり以外は、粒径がほぼ均一で
あることがわかる。また、湯気は粒径が５．０〜６．４
１であり、煙に比較して粒径が大きいから煙との識別が
できるのである。すなわち、粒子の種類によりパターン
検出装置３での受光強度分布は、第２図（ａ）〜（ｈ）
のように変化するから、上記判別装置６においてこの強
度分布を識別すれば、水蒸気やほこりによる誤報を防止
できるのである。
」１記実施例では、パターン検出装置３として、多数の
ホトセル２を配列したものを用いているが、２次元イメ
ージセンサ等の撮像装置を用いてもよい。また、レーザ
光源１の波長を短くし、ホトセル２の数を増やせば分解
能を高めることができる。
さらに、火災時に発生する黒煙のように透過率が低い煙
の場合には、パターン検出装置３での受光量が小さくな
り、受光強度の分布が不明瞭になるから、火災感知器に
用いる場合には、煙粒子の粒径の検出とともに、レーザ
光源］から監視空間を通さずに光ファイバにより参照光
を導出し、この参照光と散乱光との強度比により煙粒子
の存在を検出する方法を併用するようにずれは、火災を
確実に検出できるようになる。As shown in FIG. 1, a laser light source is provided as a light projecting means, and projects a light beam that is a bundle of parallel light rays having coherence. The light receiving means is arranged facing the laser light source,
The space between the smoke particle a and the laser light source becomes a monitoring space into which smoke particles a and particles other than smoke are introduced. The light receiving means is a pattern detection device 3 in which a large number of circular photocells 2 are arranged concentrically.
and a Fourier transform lens 4 disposed in front of the pattern detection device 3. That is, the smoke particles introduced into the monitoring space cause the light beams emitted from the laser light source 1 to be
is scattered, and a diffraction image resulting from forward small angle scattering is subjected to two-dimensional Fourier transformation through the Fourier transformation lens 4, and this transformed image is formed on the light receiving surface of the pattern detection device 3. The Fourier transform lens 4 has an incident angle θ of a light beam with respect to the optical axis, an image height meter 1, and a focal length f such that h=f・5.
The lens is set in a relationship of 111θ, and when diffracted light passes through the Fourier transform lens 4, diffraction images of each order are formed at equal intervals. That is,
The distance from the optical axis at the light receiving surface of the pattern detection device 3 is a sine function of the scattering angle. By using the Fourier transform lens 4, the pattern detection device 3 can be designed simply by arranging the photocells 2 at equal intervals on the light receiving surface. The Fourier transform lens 4 is held by a fine adjustment device 5, and can adjust the angle of the optical axis of the Fourier transform lens 4 with respect to the light receiving surface of the pattern detection device 3, and adjust the distance from the pattern detection device 3. It is now possible to do so. The output of the pattern detection device 3 is input to a discriminating device 6 such as a microcomputer that constitutes a discriminating means. The discrimination device 6 measures the particle size of smoke particles based on the distribution pattern of the light intensity received by the diffracted light pattern detection device 3, and issues an alarm when the particle size is determined to correspond to smoke particles. The discrimination device 6 discriminates the type of particle based on the intensity distribution of the diffracted light as shown below. That is, when the intensity distribution of light falling on a diffraction image is measured using a light projecting means and a light receiving means having the same configuration as in the above embodiment, the results shown in FIG. 2 are obtained. Here, as the laser light source 1, the output wavelength is 633 nm.
A helium-neon laser is used, 32 photocells 2 are provided, the focal length of the Fourier transform lens 4 is 63wx, and the minimum diameter of particles that can be measured is approximately 0.1 ul. In addition, in Figures 2 (a) to (11), the horizontal axis of the outer graph is the particle size (unit: μR), the vertical axis is the particle number density (unit: %), and the horizontal axis of the inner graph is Number of photocell 2,
The vertical axis does not indicate the received light intensity. The photocells 2 are arranged in concentric circles, starting from the inside], 2. ..., numbered 32. Therefore, for particles with small diameters that result in a large diffraction angle, photocells with large numbers are used.
Since the received light intensity increases and the diffraction angle decreases for particles with a large particle size, photocells 2 with small numbers are used.
The received light intensity increases. Figures 2 (a) to (e) are
Urethane, kerosene, paper, wood, and cotton wicks each cost 500~
The particle size of combustion smoke was measured by heating it in an electric furnace at 600°C. Figures 2 (f) to (11) show the measurement results for cigarette smoke, steam, and lumps, respectively. It is. The measured particle sizes were as shown in the table below. From the above measurement results, it can be seen that the particle size is almost uniform except for the lumps. In addition, the particle size of steam is 5.0 to 6.4.
1, and can be distinguished from smoke because its particle size is larger than that of smoke. That is, depending on the type of particles, the received light intensity distribution at the pattern detection device 3 is as shown in FIGS. 2(a) to (h).
Therefore, by identifying this intensity distribution in the discrimination device 6, false alarms due to water vapor or dust can be prevented. In the first embodiment, an arrangement of a large number of photocells 2 is used as the pattern detection device 3, but an imaging device such as a two-dimensional image sensor may also be used. Furthermore, the resolution can be improved by shortening the wavelength of the laser light source 1 and increasing the number of photocells 2. Furthermore, in the case of smoke with low transmittance, such as black smoke generated during a fire, the amount of light received by the pattern detection device 3 becomes small and the distribution of the received light intensity becomes unclear, so when used in a fire detector. In addition to detecting the particle size of smoke particles, there is a method in which reference light is derived from a laser light source through an optical fiber without passing through the monitoring space, and the presence of smoke particles is detected based on the intensity ratio of this reference light and scattered light. If used in conjunction with this deviation, fires can be detected reliably.
本発明は上述のように、干渉性を有する平行光線束より
なる光ビームを投光する投光手段と、投光手段に対向し
て配置され光ビーｌ＼の煙粒子による散乱光を受光する
受光手段と、受光手段による受光信号に基づいて煙粒子
の粒径を計測することにより煙粒子の存在を検出する判
別手段とを有する粒径計測型煙感知器において、受光手
段を、投光手段の光軸に直交する受光面を有し受光面上
での光の強度分布を検出するパターン検出装置と、前方
微小角散乱による各次数の回折像を上記パターン検出装
置の受光面上に等間隔に結像するフーリエ変換レンズと
て構成し、判別手段ではパターン検出装置て受光した光
の強度分布に基づいて粒径を計測するようにしているも
のであり、煙粒子の粒径に基づいて煙粒子の存在を検出
するから、水蒸気やほこりなどの煙とは粒径の異なる他
の粒子での散乱による誤報を防止できるという利点があ
る。また、灯具外の粒子による誤報が防止できる結果、
煙粒子が所定時間以上に亙って検出されるときに発報す
るというような蓄積型の構成とする必要かないから、火
災感知器として用いれば、火災の早期発見が行えるよう
になるのである。As described above, the present invention includes a light projecting means for projecting a light beam consisting of a bundle of parallel light beams having coherence, and a light projecting means disposed opposite to the light projecting means to receive scattered light from smoke particles of the light beam l\. In a particle size measurement type smoke sensor comprising a light receiving means and a discriminating means for detecting the presence of smoke particles by measuring the particle size of the smoke particles based on a light reception signal by the light receiving means, the light receiving means is combined with a light emitting means. A pattern detection device having a light receiving surface perpendicular to the optical axis of the pattern detecting device and detecting the intensity distribution of light on the light receiving surface, and diffraction images of each order due to forward small angle scattering are arranged at equal intervals on the light receiving surface of the pattern detecting device. The discriminating means measures the particle size based on the intensity distribution of the light received by the pattern detection device. Because it detects the presence of particles, it has the advantage of preventing false alarms caused by scattering by particles that have a different particle size from smoke, such as water vapor or dust. In addition, as a result of preventing false alarms caused by particles outside the lamp,
Since there is no need for an accumulation type configuration in which an alarm is issued when smoke particles are detected for a predetermined period of time or more, if used as a fire detector, fires can be detected early.
第１図は本発明の実施例を示す概略構成図、第２図は同
上における各粒子に対応する受光強度の分布状態を示す
原理説明図である。
■ ・レーザ光源、２・ホｌ〜セル、３ パターン検出
装置、４・・フーリエ変換レンズ、５ 微調整装置、６
・−判別装置。
代理人 弁理士 石 １）長 七
第２図
（ａ）
（ｂ）
第２図
（ｄ）
（ｅ）
（Ｃ）
（ｆ）FIG. 1 is a schematic configuration diagram showing an embodiment of the present invention, and FIG. 2 is a principle explanatory diagram showing the distribution state of the received light intensity corresponding to each particle in the same as above. ■ Laser light source, 2 Hol~cell, 3 Pattern detection device, 4 Fourier transform lens, 5 Fine adjustment device, 6
-Discrimination device. Agent Patent Attorney Ishi 1) Chief 7 Figure 2 (a) (b) Figure 2 (d) (e) (C) (f)
Claims (1)
光する投光手段と、投光手段に対向して配置され光ビー
ムの煙粒子による散乱光を受光する受光手段と、受光手
段による受光信号に基づいて煙粒子の粒径を計測するこ
とにより煙粒子の存在を検出する判別手段とを有する粒
径計測型煙感知器において、受光手段は、投光手段の光
軸に直交する受光面を有し受光面上での光の強度分布を
検出するパターン検出装置と、前方微小角散乱による各
次数の回折像を上記パターン検出装置の受光面上に等間
隔に結像するフーリエ変換レンズとを備え、判別手段は
パターン検出装置で受光した光の強度分布に基づいて粒
径を計測することを特徴とする粒径計測型煙感知器。(1) A light projecting means for projecting a light beam consisting of a bundle of parallel light rays having coherence, a light receiving means disposed opposite to the light projecting means and receiving light scattered by smoke particles of the light beam, and a light receiving means; In a particle size measurement type smoke detector, the light receiving means includes a light receiving means perpendicular to the optical axis of the light projecting means. A pattern detection device having a surface and detecting the intensity distribution of light on the light receiving surface, and a Fourier transform lens that forms diffraction images of each order due to forward small angle scattering at equal intervals on the light receiving surface of the pattern detection device. A particle size measurement type smoke detector, characterized in that the discrimination means measures the particle size based on the intensity distribution of light received by the pattern detection device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1122570A JP2740262B2 (en) | 1989-05-16 | 1989-05-16 | Particle size measurement smoke detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1122570A JP2740262B2 (en) | 1989-05-16 | 1989-05-16 | Particle size measurement smoke detector |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02300647A true JPH02300647A (en) | 1990-12-12 |
| JP2740262B2 JP2740262B2 (en) | 1998-04-15 |
Family
ID=14839172
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1122570A Expired - Lifetime JP2740262B2 (en) | 1989-05-16 | 1989-05-16 | Particle size measurement smoke detector |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2740262B2 (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0571077A2 (en) * | 1992-05-18 | 1993-11-24 | IEI PTY Ltd. | Fluid pollution monitor |
| JPH06103475A (en) * | 1992-09-21 | 1994-04-15 | Nittan Co Ltd | Environmental state monitoring device |
| JP2007265457A (en) * | 2000-02-10 | 2007-10-11 | Martin Terence Cole | Improvement of smoke detector, particularly ducted smoke detector |
| CN103364346A (en) * | 2012-03-26 | 2013-10-23 | 中国科学院城市环境研究所 | Fast-Fourier-transform-based open-circuit measurement method for smoke plume opacity |
| JP2017004101A (en) * | 2015-06-05 | 2017-01-05 | 富士通株式会社 | Fire detection device, fire detection system, fire detection method, and fire detection program |
| JP2019120975A (en) * | 2017-12-28 | 2019-07-22 | ホーチキ株式会社 | Fire alarm facility |
| CN110070691A (en) * | 2018-01-24 | 2019-07-30 | 上海云杉信息科技有限公司 | A kind of smog alarm method and system, storage medium and terminal |
| CN110102168A (en) * | 2019-05-17 | 2019-08-09 | 重庆三峰环境集团股份有限公司 | A kind of garbage-incineration smoke purifying device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5115487A (en) * | 1974-07-29 | 1976-02-06 | Matsushita Electric Works Ltd | HIKARISANRANSHIKIKEMURIKANCHIKI |
| JPS57175595A (en) * | 1981-04-24 | 1982-10-28 | Nippon Light Metal Co | Method and device for extracting drink from vessel |
| JPS62199583U (en) * | 1986-06-10 | 1987-12-18 | ||
| JPS63157035A (en) * | 1986-12-19 | 1988-06-30 | Dan Kagaku:Kk | Smoke sensor |
-
1989
- 1989-05-16 JP JP1122570A patent/JP2740262B2/en not_active Expired - Lifetime
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5115487A (en) * | 1974-07-29 | 1976-02-06 | Matsushita Electric Works Ltd | HIKARISANRANSHIKIKEMURIKANCHIKI |
| JPS57175595A (en) * | 1981-04-24 | 1982-10-28 | Nippon Light Metal Co | Method and device for extracting drink from vessel |
| JPS62199583U (en) * | 1986-06-10 | 1987-12-18 | ||
| JPS63157035A (en) * | 1986-12-19 | 1988-06-30 | Dan Kagaku:Kk | Smoke sensor |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0571077A2 (en) * | 1992-05-18 | 1993-11-24 | IEI PTY Ltd. | Fluid pollution monitor |
| EP0571077A3 (en) * | 1992-05-18 | 1994-01-05 | IEI PTY Ltd. | Fluid pollution monitor |
| JPH06103475A (en) * | 1992-09-21 | 1994-04-15 | Nittan Co Ltd | Environmental state monitoring device |
| JP2007265457A (en) * | 2000-02-10 | 2007-10-11 | Martin Terence Cole | Improvement of smoke detector, particularly ducted smoke detector |
| CN103364346A (en) * | 2012-03-26 | 2013-10-23 | 中国科学院城市环境研究所 | Fast-Fourier-transform-based open-circuit measurement method for smoke plume opacity |
| JP2017004101A (en) * | 2015-06-05 | 2017-01-05 | 富士通株式会社 | Fire detection device, fire detection system, fire detection method, and fire detection program |
| JP2019120975A (en) * | 2017-12-28 | 2019-07-22 | ホーチキ株式会社 | Fire alarm facility |
| CN110070691A (en) * | 2018-01-24 | 2019-07-30 | 上海云杉信息科技有限公司 | A kind of smog alarm method and system, storage medium and terminal |
| CN110102168A (en) * | 2019-05-17 | 2019-08-09 | 重庆三峰环境集团股份有限公司 | A kind of garbage-incineration smoke purifying device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2740262B2 (en) | 1998-04-15 |
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